DeltaMapper.OpenTelemetry 0.2.0-alpha

.NET 10.0 This package targets .NET 10.0. The package is compatible with this framework or higher.
This is a prerelease version of DeltaMapper.OpenTelemetry.
There is a newer version of this package available.
See the version list below for details. 
dotnet add package DeltaMapper.OpenTelemetry --version 0.2.0-alpha
                    


                    

                
NuGet\Install-Package DeltaMapper.OpenTelemetry -Version 0.2.0-alpha
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="DeltaMapper.OpenTelemetry" Version="0.2.0-alpha" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="DeltaMapper.OpenTelemetry" Version="0.2.0-alpha" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="DeltaMapper.OpenTelemetry" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add DeltaMapper.OpenTelemetry --version 0.2.0-alpha
                    


                    

                
#r "nuget: DeltaMapper.OpenTelemetry, 0.2.0-alpha"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package DeltaMapper.OpenTelemetry@0.2.0-alpha
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=DeltaMapper.OpenTelemetry&version=0.2.0-alpha&prerelease
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=DeltaMapper.OpenTelemetry&version=0.2.0-alpha&prerelease
                    


                            Install as a Cake Tool

DeltaMapper

Fast, diff-aware .NET object mapper. MIT licensed. Minimal dependencies.

Why DeltaMapper?

  • Near-zero overhead — source-generated direct calls run at 7 ns, same as hand-written code
  • MappingDiff<T> — map and get a structured change set in one call
  • Source generator — [GenerateMap] emits assignment code at build time, zero reflection
  • Full IMapper pipeline — DI, middleware, hooks, EF Core proxy detection, OpenTelemetry tracing

Install

dotnet add package DeltaMapper                    # core runtime
dotnet add package DeltaMapper.SourceGen          # optional: compile-time codegen
dotnet add package DeltaMapper.EFCore             # optional: EF Core proxy awareness
dotnet add package DeltaMapper.OpenTelemetry      # optional: Activity spans

Requires .NET 10+.

Quick Start

public class UserProfile : MappingProfile
{
    public UserProfile()
    {
        CreateMap<User, UserDto>()
            .ForMember(d => d.FullName, o => o.MapFrom(s => $"{s.First} {s.Last}"))
            .ReverseMap();
    }
}

var mapper = MapperConfiguration.Create(cfg => cfg.AddProfile<UserProfile>())
    .CreateMapper();

var dto = mapper.Map<User, UserDto>(user);

Built-in Change Tracking

var diff = mapper.Patch(updateDto, existingUser);

if (diff.HasChanges)
    await auditLog.RecordAsync(userId, diff.Changes);

Flattening and Unflattening

Nested objects are flattened to flat DTOs and back automatically — no configuration required.

// Order.Customer.Name → CustomerName (flattening)
CreateMap<Order, OrderFlatDto>();

// CustomerName → Customer.Name (unflattening)
CreateMap<OrderFlatDto, Order>();

Assembly Scanning

// Register all profiles in an assembly in one call
cfg.AddProfilesFromAssemblyContaining<UserProfile>();

Type Converters

// Apply a conversion across every map that has a matching type pair
cfg.CreateTypeConverter<string, DateTime>(s => DateTime.Parse(s));

Performance

What's being mapped DeltaMapper vs Mapperly vs AutoMapper
Simple object (5 properties) 7 ns Same speed 7x faster
Nested object (parent + child) 24 ns Same speed, 33% less memory 2x faster
Collection (10 items) 22 ns 5x faster, 8x less memory 8x faster

Getting Help

Product Compatible and additional computed target framework versions.
.NET net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
1.2.0 101 4/7/2026
1.1.0 101 4/6/2026
1.0.0 101 4/2/2026
1.0.0-rc.8 58 3/23/2026
1.0.0-rc.7 55 3/21/2026
1.0.0-rc.6 53 3/21/2026
1.0.0-rc.5 55 3/21/2026
1.0.0-rc.4 57 3/20/2026
1.0.0-rc.3 54 3/20/2026
1.0.0-rc.2 50 3/20/2026
1.0.0-rc.1 55 3/19/2026
0.2.0-alpha 90 3/19/2026
0.1.0-alpha 93 3/18/2026